# CVE-2010-20112: Amlibweb NetOpacs webquery.dll Stack Buffer Overflow

> A stack buffer overflow in Amlib NetOpacs allows remote attackers to execute arbitrary code via crafted HTTP GET parameters.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Aug 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-4mw2-xrgp-grww

## What is CVE-2010-20112?

CVE-2010-20112 is a critical memory corruption vulnerability in Amlibweb Library Management System, published on 21 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Amlib’s NetOpacs webquery.dll contains a stack-based buffer overflow vulnerability triggered by improper handling of HTTP GET parameters. Specifically, the application fails to enforce bounds on input supplied to the app parameter, allowing excessive data to overwrite memory structures including the Structured Exception Handler (SEH). Additionally, malformed parameter names followed by an equals sign may result in unintended control flow behavior. This vulnerability is exposed through IIS and affects legacy Windows deployments

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2010-20112?


## How do I fix CVE-2010-20112?

No fix has been published for CVE-2010-20112 yet. Limit exposure of the affected software until one is available.

## Is CVE-2010-20112 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-20112 exists.

Public exploit code:

- Amlibweb NetOpacs webquery.dll Stack Buffer Overflow (metasploit)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2010-20112 and fix it if it is affected.

What it is: CVE-2010-20112 is a critical memory corruption vulnerability in Amlibweb Library Management System, published on 21 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-20112 exists.

Affected product: Amlibweb Library Management System. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2010-20112/ (Markdown: https://insights.sbomify.com/CVE-2010-20112/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-20112
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-20112
- OSV: https://osv.dev/vulnerability/CVE-2010-20112

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-20112/
Summaries are generated and may contain mistakes; the official description above is the record.